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Quote from: Yahya A.Sharif on 27/07/2021 16:31:04A massive human can stand on weak toesIt is clear that toes are not weak.Why do you nor realise this obvious fact?
A massive human can stand on weak toes
I want to prove it by another argument.
when a human knees bears its own body the body will be lighter than bearing any other equivalent mass.
The idea is as I repeated many times
You do realize that your knees are under much greater stress when they have to hold up both a 60 kilogram rock and the rest of your body than they are when they only have to deal with your body, right?
Quote from: Kryptid on 27/07/2021 19:40:55You do realize that your knees are under much greater stress when they have to hold up both a 60 kilogram rock and the rest of your body than they are when they only have to deal with your body, right?Yes. I can do the calculations. lifting the upper part alone is 60 kg. lifting the total with the rock is 120 .By lifting a 120 kg I double the load, if the knees bear the rock for one day the knees ability to bear is doubled by 18250 times. It is like putting on stomach a 1 kg vs putting on your stomach 18.25 tons
Quote from: Yahya A.Sharif on 27/07/2021 20:16:01Quote from: Kryptid on 27/07/2021 19:40:55You do realize that your knees are under much greater stress when they have to hold up both a 60 kilogram rock and the rest of your body than they are when they only have to deal with your body, right?Yes. I can do the calculations. lifting the upper part alone is 60 kg. lifting the total with the rock is 120 .By lifting a 120 kg I double the load, if the knees bear the rock for one day the knees ability to bear is doubled by 18250 times. It is like putting on stomach a 1 kg vs putting on your stomach 18.25 tonsYou seem to have posted random numbers.
A shelf can hold up a rock for a minute or a year. It doesn't need to be stronger to hold it for longer.Your ideas make no sense.
Increasing in weight during age will cause knee disabilityhttps://www.everydayhealth.com/knee-pain/why-knee-pain-worsens-with-age.aspxBut this still after 50 years or so, because it is still human body on its own knees. On the other hand this will happen shortly if carrying a load.https://www.gomberamd.com/blog/how-does-lifting-weight-impact-your-joints-21917.html
Quote from: Bored chemist on 27/07/2021 22:50:51A shelf can hold up a rock for a minute or a year. It doesn't need to be stronger to hold it for longer.Your ideas make no sense.Increasing in weight during age will cause knee disability https://www.everydayhealth.com/knee-pain/why-knee-pain-worsens-with-age.aspxBut this still after 50 years or so, because it is still human body on its own knees. On the other hand this will happen shortly if carrying a load.https://www.gomberamd.com/blog/how-does-lifting-weight-impact-your-joints-21917.html
did you give up on that?
Quote from: Yahya A.Sharif on 28/07/2021 00:10:20Quote from: Bored chemist on 27/07/2021 22:50:51A shelf can hold up a rock for a minute or a year. It doesn't need to be stronger to hold it for longer.Your ideas make no sense.Increasing in weight during age will cause knee disability https://www.everydayhealth.com/knee-pain/why-knee-pain-worsens-with-age.aspxBut this still after 50 years or so, because it is still human body on its own knees. On the other hand this will happen shortly if carrying a load.https://www.gomberamd.com/blog/how-does-lifting-weight-impact-your-joints-21917.htmlGetting old means losing the ability to repair the damage done by tings like carrying heavy loads.It has nothing to do with making the forces bigger or smaller.
Quote from: Origin on 28/07/2021 01:09:26did you give up on that?No. I'm right in all of these
Quote from: Yahya A.Sharif on 27/07/2021 18:16:31I want to prove it by another argument.You can not prove it, because it is obviously wrong.In fact you are wrong twice.This is wrong"A massive human can stand on weak toes"because toes are obviously weak.And this is wrongQuote from: Yahya A.Sharif on 27/07/2021 18:16:31when a human knees bears its own body the body will be lighter than bearing any other equivalent mass.because it is nonsense.Either the mass is equivalent (i.e. the same) or it is not.
This is meaningless.
If my knees can bear massive 40 kg "my upper body" for years then the force by my 40 kg upper part on my knees is small.A smaller force by upper part of 40 kg on knees means I can overcome this force and lift the upper body by a small force, this is why jumping with massive 40 kg is effortless compared to even moving a rock with the same mass of 40 kg and this exactly what I said before.
If my knees can bear massive 40 kg "my upper body" for years then the force by my 40 kg upper part on my knees is small. A smaller force by upper part of 40 kg on knees means I can overcome this force and lift the upper body by a small force, this is why jumping with massive 40 kg is effortless compared to even moving a rock with the same mass of 40 kg and this exactly what I said before.